Expansible band-building drum



Feb. 25, 1947. u. c. HAREN ETAL EXP-ANSIBLE BAND-BUILDING DRUM Filed sept. 1, 1944 2 Sheets-Sheet 1 Feb. 25',

U. c. HAREN ETAL EXPANS IBLE BAND-BUILDING DRUM ammsmm Filed Sept; l, 1944 um lili 2 Sheets-Sheet 2 Patented Feb. 25 1947 g z,i16,523

,y .1. This inventionrelates to band-hu ding drums for use in preparing-bands vof material for making tires andv other .articles and isparticularly useful where endlessbands of a considerable range of sizes are desired. e

y In the buildingof pneumatic` tirecasings strips of sheet material such as 4,cordfabrictor weftless cords havebeen -laid without tension about 'a sired size thereon.- The endless bands have then been removed; endwiseifrornthe band-building drum and stored ,for subsequent use byl the tire builder. Y'

The principal'objects of this' invention are to provide a AbandIbui'ldi'rig'.drliii'i having. adjustment of its circumference over a wide range to .provide forv buildingr a range of sizes of band on a single drum and `at thesame'time to provide means for lquickly Iremoving the band without requiring collapse of'the'drin, to provide' ease of adjustabiuty, and toiprvidliuiciilactingadjustment.

These4 and other objectsl-.ivili appear from the following descriptionand theaccompanying draw; ings. Y

Of the drawings, c

Fig. 1 is a side elevation of a drum made in accordance with and embodying the invention mounted upon a driving unit, parts being broken away and parts shown in section,

Fig. 2 is an end elevation of the drum, parts being broken away and parts shown in section,

Fig. 3 is a detail sectional view taken online 3-3 of Fig. 2,

Fig. 4 is a detail sectional view taken on line 4-4 of Fig. 2, l

Fig. 5 is a. detail sectionm view taken 'on une 5-5 of Fig. 2,

Fig. 6-is a sectional view taken on line vIS-'B of Fig. 1, parts being lbroken away, and

Fig. 7 is a detail sectional view of the shell tensioning mechanism.

Referring to the drawings, the numeral III designates a supporting and drivingunit having a lrotatable hollow shaft Il journaled therein. A pulley I2 is fixed to the shaft and is adapted to be driven by belts I3 from any desired source of power such as an electric motor (not shown). The shaft I I extends horizontally to support and rotate the band building drum I4.

Supported about the shaft Il and spaced radially therefrom are a pair of semicircular shell sections I5, IB arranged with their ends over-v lapping each other to provide an adjustable drum surface." The shell sectionsare of flexible'sheet metal and are ysupported from the shaft II at lcylindrical d rurrnltand haveg'gbeen spliced to de Vl() tweenl the discs I1'V,I.9/and the ,gear 36 between'` their position of .smallest adjusted dimension by axially spaced apart discs"l1, I8. e together with similar discs I9, 20spaced axially therefrom by spacers21 and bolts 28, respectively, fora purpose hereinafter described, are secured by Vbolts 2|,.242 to. collars 23, 24 in turnr xedto the shaft II.v Cushioriing engagement of thefshell sections I 5, .I6 with theperiinetersof the discs SI1,

I3 is provided "by strips of leather 2 5 secured't'o he inner faces ofthe shellsectionsbyrivets 126;

- vFor expanding the shell 'to-largerV dimensions,

` a pair ofgears ,35,y 35are rotatably mountedabout the collars l 23,24v respectively, the gear. 35 bediscs, I8 and.2.f."Each gear has spiral scroll'slots suchlas' 313m i ,oppositeside facesvBadial gui dey strips. 38- are 'fxe'd to the discs and `rde'ine radial grooves in which radial arms 39 are slide ably mounted.` `Opposite arms are fixed together beyondthe gears by'js'pacing bloels 40 and rivets y 4I. The arms have'antifrctionrollers 42 pinned x thereto to engage in thescroll slots; A'Ihe arQ rangenient..is`.suchl that lrotation of fthey gears'` in one 'direction extend's'the ar'rn's radially and in the opposite direction retracts them.

For rotating the gears, a pair ofpinions 45, are rotatably journaled in the plates I'I, I8 and are connected together by a hollow shaft 41 to which they are fixed. The pinions 45, 46 are arfranged to mesh with gears 35, 35 respectively. Pinion 46 has a square bore 43 for engaging the squared shank of a removablev crank 49 whereby the pinions and shaft V41, and with ythem gears 35, 35 are rotated. Pinion 45 also has a square bore 50. Hspring-pressed locking pin 5I isslidably mounted in a block 53 secured to disc I 'I whereby it may be axially withdrawn from the gear 45 when adjustments are to be made. It is returned by its spring 52.

plate 6D fixed thereto and extending under the end of plate I5 to retain the ends of theshell members in sliding relation. An extension coil spring 52 has one end xed to shell section I5 at a distance from the end of the section, as at 63, and its other end is fixed as at 64 to shell section IE. The other ends of the shell sections are similarly provided with guides and coil springs for the purpose of retracting the sectionswhen the radialY arms are retracted. The radial arms adjacent the leading ends of the sections are secured to the section as at 65, 65, respectively to limit rotation of the shell structure with relation to the radial ari-ns. i

These discs .y

To provide for quick removal of the bands from the drum irrespective of adjustment, axially `extending pipes '50, having closed ends are welded to the shell sections at spaced intervals and apertures 1I are formed through the shell section connecting with the pipes. Each pipe has a branch nipple 'i2 secured thereto. Y A hollow collar 13 of channel cross section is rotatably mounted l about shaft il and held in place by a stop collar 'I4 and;co1lar 23 against axial movement.

Its

channelfis connected by apertures 15 through l the shell sections both radiallyi and circumof the shell sections, a finished band may be re s shaft H withthe hollow interior of the shaft. A 1 swivel pipe connection 16 connects a stationary pipe 'i7V with ariV open end of shaft l l. Each. pipe l. 1 `Hl is connected to a nipple communicatngwith l the channel of collar 13 by aexibl'e. hose 8.0hav- Ving a slackloop 8l which permits movement of i ferentially withrespect to the shaft Il. The ar- A rangement is such that at any adjusted position moved from the drum byl admitting vair under air film betweenit and thedrum surface. Y The operation of the drum isj as follows: l.With

the. stop pin 5! withdrawn and the crank 49 inserted in the bore of gear 46, the; crank is rotated 1 and with it. gears 35,36 are turned to: move the arms 39: radially to adjust the shell to thedesired g size.. The",crank-ijs then withdrawn and the pin 5! returned tolocking position. Sheet material i pressure to the face ofthe shell sections softhat the band maybe removedwhile cushioned on the is laid about the drum and spliced Vin endless ,i

form. The air under'pressureis thenV admitted through pipeY 11 to the apertures H where it' forms, a, lnr of compressed airvb'etween the 1 iinished band and the drumiace to lift the band 3 therefrom. Y' The band is removed axially ofthe drum. Y Variations may from the scope of the.V invention `hy thefollowing claims.'V

be made without departing y We claim: f f -L A Vband-building,drum comprisinga pluas it is" defined Num-ber Name .Date y u 1,731,817 p Hudson 00u15, 1929 l2,132,324 Y schrank 1 1. oct. 4, 193s 2,053,815 De Panthouet ai. sept. s, 193e y EonEiGnr-'ATENTS Number Acountryl ``Date of circumferentially overlapping shell sections I providing a. continuous band-supporting surface,

a rotatable support for said sectionsfmeans including' a scroll cam for simultaneouslymoving said sections radially 0f said support to adjust the diameter of the drum concentrically throughout a. range to suit bands of different diameters, said sections Veach being provided with perforations for discharging uifd under pressure from their peripheral surfaces *forV removing `bands from the drum without disturbing its adjustment,

and extensiblemeans for conducting fluid underr lpressure from said support to said sections at all positions of' diametfrlcal adjustment thereof'.

` URBAN C. HAREN;VA l

JVICTCJR H. HASSELQUIST.v

REFERENCES CITED' The following references are ofl recordin fthe file of this patent: 1 1.

UNITED STATES PATENTS 

